In my opinion/experience:
ST: screw until ~6am, girl goes off.
LT: screw until ~6am, sleep w/ girl, wake up about lunch time, screw again, maybe lunch w/ girl if you want, girl goes off.
I think 2.5k was alright lah... I'm not sure about the prevailing 3some rates though. Also, I think they were quite sporting... screw until 6am+. In certain situations/places, ST could also mean you go to a ST room, fire 1 shot, shower, finish... girl goes back to bar to wait for next customer.